Were you wanting something like this?

#!/usr/local/bin/perl

use strict;
use warnings;

use Tk;
use Tk::Photo;

my $mw = new MainWindow;
$mw -> geometry ("820x780");
my @files = <*gif>;



for my $image (@files)
{
   my $shot = $mw->Photo(-file => "$image");
   my $btn = $mw->Button(-image => $shot)->pack();
   $btn->update;
   
   sleep(1);
   select(undef, undef, undef, .1);
   $btn->destroy;
}

$mw->MainLoop;
[download]

This gives a slideshow type effect by creating, updating and destroying the button for each image.